Study of anti-glass phases in heavy metal oxide tellurite systems

Glass and anti-glass samples of Bi2O3-TeO2 and Bi2O3-Nb2O5-TeO2 were prepared by ice quenching and normal quenching, respectively. Bi2O3-TeO2 system forms glass only up to 3-mol% of Bi2O3 however the higher concentration of Bi2O3 leads to the formation of an anti-glass phase of Bi2Te4O11. An anti-gl...

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Bibliographic Details
Main Authors: Gupta, Nupur, Khanna, Atul
Format: Conference Proceeding
Language:English
Subjects:
Bismuth oxides
Bismuth trioxide
Boron oxides
Glass
Heavy metal oxides
Heavy metals
Inclusions
Long range order
Niobium oxides
Quenching
Spherulites
Statistical methods
Tellurium dioxide
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Summary:Glass and anti-glass samples of Bi2O3-TeO2 and Bi2O3-Nb2O5-TeO2 were prepared by ice quenching and normal quenching, respectively. Bi2O3-TeO2 system forms glass only up to 3-mol% of Bi2O3 however the higher concentration of Bi2O3 leads to the formation of an anti-glass phase of Bi2Te4O11. An anti-glass is a solid material in which the cations (Te4+, Bi3+, Nb5+) have long-range order but are statistically distributed at their sites while the anion sites are partially vacant. The addition of Nb2O5 to the Bi2O3-TeO2 system enhances the glass forming ability to a considerable extent. Samples from the system: xBi2O3-xNb2O5-(100-2x)TeO2 grow micro-inclusions or spherulites of the size of several micron within the glass matrix on slow melt-cooling. The addition of small amount of B2O3 is detrimental for the formation of anti-glass inclusions and forms purely glassy phase upon splat quenching. To functionalize these materials for luminescent applications, Dy3+ ions have been doped into the Bi2O3-Nb2O5-TeO2 system.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5113091